1/*
2 * This file is part of the MicroPython project, http://micropython.org/
3 *
4 * The MIT License (MIT)
5 *
6 * Copyright (c) 2013, 2014 Damien P. George
7 *
8 * Permission is hereby granted, free of charge, to any person obtaining a copy
9 * of this software and associated documentation files (the "Software"), to deal
10 * in the Software without restriction, including without limitation the rights
11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
12 * copies of the Software, and to permit persons to whom the Software is
13 * furnished to do so, subject to the following conditions:
14 *
15 * The above copyright notice and this permission notice shall be included in
16 * all copies or substantial portions of the Software.
17 *
18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
21 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
24 * THE SOFTWARE.
25 */
26
27#include <stdlib.h>
28#include <assert.h>
29
30#include "py/runtime.h"
31
32#if MICROPY_PY_BUILTINS_ENUMERATE
33
34typedef struct _mp_obj_enumerate_t {
35 mp_obj_base_t base;
36 mp_obj_t iter;
37 mp_int_t cur;
38} mp_obj_enumerate_t;
39
40STATIC mp_obj_t enumerate_iternext(mp_obj_t self_in);
41
42STATIC mp_obj_t enumerate_make_new(const mp_obj_type_t *type, size_t n_args, size_t n_kw, const mp_obj_t *args) {
43 #if MICROPY_CPYTHON_COMPAT
44 static const mp_arg_t allowed_args[] = {
45 { MP_QSTR_iterable, MP_ARG_REQUIRED | MP_ARG_OBJ, {.u_obj = MP_OBJ_NULL} },
46 { MP_QSTR_start, MP_ARG_INT, {.u_int = 0} },
47 };
48
49 // parse args
50 struct {
51 mp_arg_val_t iterable, start;
52 } arg_vals;
53 mp_arg_parse_all_kw_array(n_args, n_kw, args,
54 MP_ARRAY_SIZE(allowed_args), allowed_args, (mp_arg_val_t *)&arg_vals);
55
56 // create enumerate object
57 mp_obj_enumerate_t *o = m_new_obj(mp_obj_enumerate_t);
58 o->base.type = type;
59 o->iter = mp_getiter(arg_vals.iterable.u_obj, NULL);
60 o->cur = arg_vals.start.u_int;
61 #else
62 mp_arg_check_num(n_args, n_kw, 1, 2, false);
63 mp_obj_enumerate_t *o = m_new_obj(mp_obj_enumerate_t);
64 o->base.type = type;
65 o->iter = mp_getiter(args[0], NULL);
66 o->cur = n_args > 1 ? mp_obj_get_int(args[1]) : 0;
67 #endif
68
69 return MP_OBJ_FROM_PTR(o);
70}
71
72const mp_obj_type_t mp_type_enumerate = {
73 { &mp_type_type },
74 .name = MP_QSTR_enumerate,
75 .make_new = enumerate_make_new,
76 .iternext = enumerate_iternext,
77 .getiter = mp_identity_getiter,
78};
79
80STATIC mp_obj_t enumerate_iternext(mp_obj_t self_in) {
81 assert(mp_obj_is_type(self_in, &mp_type_enumerate));
82 mp_obj_enumerate_t *self = MP_OBJ_TO_PTR(self_in);
83 mp_obj_t next = mp_iternext(self->iter);
84 if (next == MP_OBJ_STOP_ITERATION) {
85 return MP_OBJ_STOP_ITERATION;
86 } else {
87 mp_obj_t items[] = {MP_OBJ_NEW_SMALL_INT(self->cur++), next};
88 return mp_obj_new_tuple(2, items);
89 }
90}
91
92#endif // MICROPY_PY_BUILTINS_ENUMERATE
93